Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Sugiyama, Naoya*; Ikehara, Suguru*; Saigusa, Mikio*; Moriyama, Shinichi; Kobayashi, Takayuki
no journal, ,
A high power wide-band polarizer has been developed for ECCD system using step tunable gyrotrons. The polarizer has been designed at frequency bands of 110, 130 and 140 GHz with analysis by the finite differential time domain method. The wide-band polarizer was designed for low-power experiments. It appears that the large ditch ratio rectangular grooved mirror is suitable for wide-band. The grooved mirror having rectangular wide ditch installed in a miter bend was designed for a wide-band polarizer.
Sugiyama, Naoya*; Oyama, Gaku*; Matsubara, Fumiaki*; Saigusa, Mikio*; Isayama, Akihiko; Kobayashi, Takayuki; Moriyama, Shinichi
no journal, ,
The development status of a wide-band polarizer for ECCD system in JT-60SA is reported. The polarizer was designed at the frequency bands of 110, 130 and 140 GHz based on the simulation results with the finite differential time domain (FDTD) method. The properties of polarizer have been measured with low power test at both of the frequency bands of 110 GHz and 138 GHz. In future work, it is necessary to draw the Poincare sphere based on an experimental result, and to optimize the depth of the grooved mirrors. After that, the wide-band polarizer with a cooling system will be designed, fabricated and tested at high power up to 1 MW.
Sugiyama, Naoya*; Oyama, Gaku*; Matsubara, Fumiaki*; Saigusa, Mikio*; Kobayashi, Takayuki; Isayama, Akihiko; Moriyama, Shinichi
no journal, ,
Electron Cyclotron Current Drive (ECCD) is one of the most promising methods of heating and driving current in fusion plasmas. Incident wave into fusion plasmas should be converted from the linear polarization of a gyrotron output mode to the specific elliptical polarization in order to generate suitable plasma wave at high mode purity. The polarizer was designed at the frequency bands of 110,130 and 140 GHz based on the simulation results with the finite differential time domain method. The mock-up polarizer has been tested with low power at the both frequency bands of 110 GHz and 138 GHz. The high power model of wide-band polarizer was designed considering the results of low power test.
Oyama, Gaku*; Sugiyama, Naoya*; Matsubara, Fumiaki*; Saigusa, Mikio*; Kobayashi, Takayuki; Isayama, Akihiko; Moriyama, Shinichi
no journal, ,
no abstracts in English